hostplugins/lv2/PluginLv2.cpp

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2008 Andreas Persson                                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,                *
 *   MA  02110-1301  USA                                                   *
 ***************************************************************************/

#include <algorithm>
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <string>

#include "PluginLv2.h"

#define NS_ATOM "http://lv2plug.in/ns/ext/atom#"
#define NS_LS   "http://linuxsampler.org/schema#"

namespace {

    PluginLv2::PluginLv2(const LV2_Descriptor* Descriptor,
                         double SampleRate, const char* BundlePath,
                         const LV2_Feature* const* Features) {
        Out[0] = 0;
        Out[1] = 0;
        UriMap = 0;
        PathSupport = 0;
        NewFileSupport = 0;
        for (int i = 0 ; Features[i] ; i++) {
            dmsg(2, ("linuxsampler: host feature: %s\n", Features[i]->URI));
            if (!strcmp(Features[i]->URI, LV2_URI_MAP_URI)) {
                UriMap = (LV2_URI_Map_Feature*)Features[i]->data;
            } else if (!strcmp(Features[i]->URI, LV2_FILES_PATH_SUPPORT_URI)) {
                PathSupport = (LV2_Files_Path_Support*)Features[i]->data;
            } else if (!strcmp(Features[i]->URI, LV2_FILES_NEW_FILE_SUPPORT_URI)) {
                NewFileSupport = (LV2_Files_New_File_Support*)Features[i]->data;
            }
        }

        Init(SampleRate, 128);

        InitState();

        DefaultState = GetState();
    }

    void PluginLv2::ConnectPort(uint32_t Port, void* DataLocation) {
        if (Port == 2) {
            MidiBuf = static_cast<LV2_Event_Buffer*>(DataLocation);
        } else if (Port < 2) {
            Out[Port] = static_cast<float*>(DataLocation);
        }
    }

    void PluginLv2::Activate() {
        dmsg(2, ("linuxsampler: Activate\n"));
    }

    void PluginLv2::Run(uint32_t SampleCount) {
        int samplePos = 0;
        uint8_t* events = MidiBuf->data;
        int eventCount = MidiBuf->event_count;
        while (SampleCount) {
            int samples = std::min(SampleCount, 128U);

            for ( ; eventCount ; eventCount--) {
                LV2_Event* event = reinterpret_cast<LV2_Event*>(events);

                int time = event->frames - samplePos;
                if (time >= samples) break;

                uint8_t* data = events + sizeof(LV2_Event);
                events += (sizeof(LV2_Event) + event->size + 7) & ~7;

                pMidiDevice->Port()->DispatchRaw(data, time);
            }
            pAudioDevice->Channel(0)->SetBuffer(Out[0] + samplePos);
            pAudioDevice->Channel(1)->SetBuffer(Out[1] + samplePos);
            pAudioDevice->Render(samples);

            samplePos += samples;
            SampleCount -= samples;
        }
    }

    void PluginLv2::Deactivate() {
        dmsg(2, ("linuxsampler: Deactivate\n"));
    }

    String PluginLv2::PathToState(const String& path) {
        if (PathSupport) {
            char* cstr = PathSupport->abstract_path(PathSupport->host_data,
                                                    path.c_str());
            const String abstract_path(cstr);
            free(cstr);
            return abstract_path;
        }
        return path;
    }

    String PluginLv2::PathFromState(const String& path) {
        if (PathSupport) {
            char* cstr = PathSupport->absolute_path(PathSupport->host_data,
                                                    path.c_str());
            const String abstract_path(cstr);
            free(cstr);
            return abstract_path;
        }
        return path;
    }

    void PluginLv2::Save(LV2_Persist_Store_Function store, void* host_data) {
        if (NewFileSupport) {
            char* path = NewFileSupport->new_file_path(PathSupport->host_data,
                                                       "linuxsampler");
            dmsg(2, ("saving to file %s\n", path));

            std::ofstream out(path);
            out << GetState();

            const String abstract_path = PathToState(path);

            store(host_data,
                  uri_to_id(NULL, NS_LS "state-file"),
                  abstract_path.c_str(),
                  abstract_path.length() + 1,
                  uri_to_id(NULL, LV2_FILES_URI "#AbstractPath"),
                  LV2_PERSIST_IS_PORTABLE);
        } else {
            dmsg(2, ("saving to string\n"));

            std::ostringstream out;
            out << GetState();

            store(host_data,
                  uri_to_id(NULL, NS_LS "state-string"),
                  out.str().c_str(),
                  out.str().length() + 1,
                  uri_to_id(NULL, NS_ATOM "String"),
                  LV2_PERSIST_IS_POD | LV2_PERSIST_IS_PORTABLE);
        }
        dmsg(2, ("saving done\n"));
    }

    void PluginLv2::Restore(LV2_Persist_Retrieve_Function retrieve, void* data) {
        size_t   size;
        uint32_t type;
        uint32_t flags;

        const void* value = retrieve(
            data,
            uri_to_id(NULL, NS_LS "state-file"),
            &size, &type, &flags);

        if (value) {
            assert(type == uri_to_id(NULL, LV2_FILES_URI "#AbstractPath"));
            const String path = PathFromState((const char*)value);
            dmsg(2, ("linuxsampler: restoring from file %s\n", path.c_str()));
            std::ifstream in(path.c_str());
            String state;
            std::getline(in, state, '\0');
            SetState(state);
            return;
        }

        value = retrieve(
                data,
                uri_to_id(NULL, NS_LS "state-string"),
                &size, &type, &flags);
        if (value) {
            dmsg(2, ("linuxsampler: restoring from string\n"));
            assert(type == uri_to_id(NULL, NS_ATOM "String"));
            String state((const char*)value);
            SetState(state);
            return;
        }

        // No valid state found, reset to default state
        dmsg(2, ("linuxsampler: restoring default state\n"));
        SetState(DefaultState);
    }

    LV2_Handle instantiate(const LV2_Descriptor* descriptor,
                           double sample_rate, const char* bundle_path,
                           const LV2_Feature* const* features) {
        return new PluginLv2(descriptor, sample_rate, bundle_path, features);
    }

    void connect_port(LV2_Handle instance, uint32_t port, void* data_location) {
        static_cast<PluginLv2*>(instance)->ConnectPort(port, data_location);
    }

    void activate(LV2_Handle instance) {
        static_cast<PluginLv2*>(instance)->Activate();
    }

    void run(LV2_Handle instance, uint32_t sample_count) {
        static_cast<PluginLv2*>(instance)->Run(sample_count);
    }

    void deactivate(LV2_Handle instance) {
        static_cast<PluginLv2*>(instance)->Deactivate();
    }

    void cleanup(LV2_Handle instance) {
        delete static_cast<PluginLv2*>(instance);
    }

    void save(LV2_Handle handle, LV2_Persist_Store_Function store, void* callback_data) {
            return static_cast<PluginLv2*>(handle)->Save(store, callback_data);
    }

    void restore(LV2_Handle handle, LV2_Persist_Retrieve_Function store, void* callback_data) {
        return static_cast<PluginLv2*>(handle)->Restore(store, callback_data);
    }

    PluginInfo PluginInfo::Instance;

    PluginInfo::PluginInfo() {
        Lv2.URI = "http://linuxsampler.org/plugins/linuxsampler";
        Lv2.activate = activate;
        Lv2.cleanup = cleanup;
        Lv2.connect_port = connect_port;
        Lv2.deactivate = deactivate;
        Lv2.instantiate = instantiate;
        Lv2.run = run;
        Lv2.extension_data = extension_data;
        Persist.save = save;
        Persist.restore = restore;
    }


    const void* extension_data(const char* uri) {
        dmsg(2, ("linuxsampler: extension_data %s\n", uri));
        if (strcmp(uri, LV2_PERSIST_URI) == 0) {
            return PluginInfo::Lv2PersistDescriptor();
        }
        return 0;
    }
}


extern "C" {
    LV2_SYMBOL_EXPORT
    const LV2_Descriptor* lv2_descriptor(uint32_t index) {
        return index == 0 ? PluginInfo::Lv2Descriptor() : 0;
    }
}
1	persson	1777	/***************************************************************************
2			* *
3			* Copyright (C) 2008 Andreas Persson *
4			* *
5			* This program is free software; you can redistribute it and/or modify *
6			* it under the terms of the GNU General Public License as published by *
7			* the Free Software Foundation; either version 2 of the License, or *
8			* (at your option) any later version. *
9			* *
10			* This program is distributed in the hope that it will be useful, *
11			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
12			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13			* GNU General Public License for more details. *
14			* *
15			* You should have received a copy of the GNU General Public License *
16			* along with this program; if not, write to the Free Software *
17			* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
18			* MA 02110-1301 USA *
19			***************************************************************************/
20
21			#include <algorithm>
22	capela	2174	#include <cassert>
23	persson	1777	#include <cstdio>
24			#include <cstdlib>
25			#include <cstring>
26			#include <fstream>
27			#include <string>
28
29			#include "PluginLv2.h"
30
31	capela	2174	#define NS_ATOM "http://lv2plug.in/ns/ext/atom#"
32			#define NS_LS "http://linuxsampler.org/schema#"
33
34	persson	1777	namespace {
35
36			PluginLv2::PluginLv2(const LV2_Descriptor* Descriptor,
37			double SampleRate, const char* BundlePath,
38			const LV2_Feature* const* Features) {
39			Out[0] = 0;
40			Out[1] = 0;
41	capela	2174	UriMap = 0;
42			PathSupport = 0;
43			NewFileSupport = 0;
44	persson	1777	for (int i = 0 ; Features[i] ; i++) {
45			dmsg(2, ("linuxsampler: host feature: %s\n", Features[i]->URI));
46	capela	2174	if (!strcmp(Features[i]->URI, LV2_URI_MAP_URI)) {
47			UriMap = (LV2_URI_Map_Feature*)Features[i]->data;
48			} else if (!strcmp(Features[i]->URI, LV2_FILES_PATH_SUPPORT_URI)) {
49			PathSupport = (LV2_Files_Path_Support*)Features[i]->data;
50			} else if (!strcmp(Features[i]->URI, LV2_FILES_NEW_FILE_SUPPORT_URI)) {
51			NewFileSupport = (LV2_Files_New_File_Support*)Features[i]->data;
52			}
53	persson	1777	}
54
55			Init(SampleRate, 128);
56
57			InitState();
58	capela	2174
59			DefaultState = GetState();
60	persson	1777	}
61
62			void PluginLv2::ConnectPort(uint32_t Port, void* DataLocation) {
63			if (Port == 2) {
64			MidiBuf = static_cast<LV2_Event_Buffer*>(DataLocation);
65			} else if (Port < 2) {
66			Out[Port] = static_cast<float*>(DataLocation);
67			}
68			}
69
70			void PluginLv2::Activate() {
71			dmsg(2, ("linuxsampler: Activate\n"));
72			}
73
74			void PluginLv2::Run(uint32_t SampleCount) {
75			int samplePos = 0;
76			uint8_t* events = MidiBuf->data;
77			int eventCount = MidiBuf->event_count;
78			while (SampleCount) {
79			int samples = std::min(SampleCount, 128U);
80
81			for ( ; eventCount ; eventCount--) {
82			LV2_Event* event = reinterpret_cast<LV2_Event*>(events);
83
84			int time = event->frames - samplePos;
85			if (time >= samples) break;
86
87			uint8_t* data = events + sizeof(LV2_Event);
88			events += (sizeof(LV2_Event) + event->size + 7) & ~7;
89
90			pMidiDevice->Port()->DispatchRaw(data, time);
91			}
92			pAudioDevice->Channel(0)->SetBuffer(Out[0] + samplePos);
93			pAudioDevice->Channel(1)->SetBuffer(Out[1] + samplePos);
94			pAudioDevice->Render(samples);
95
96			samplePos += samples;
97			SampleCount -= samples;
98			}
99			}
100
101			void PluginLv2::Deactivate() {
102			dmsg(2, ("linuxsampler: Deactivate\n"));
103			}
104
105	capela	2174	String PluginLv2::PathToState(const String& path) {
106			if (PathSupport) {
107			char* cstr = PathSupport->abstract_path(PathSupport->host_data,
108			path.c_str());
109			const String abstract_path(cstr);
110			free(cstr);
111			return abstract_path;
112			}
113			return path;
114			}
115	persson	1777
116	capela	2174	String PluginLv2::PathFromState(const String& path) {
117			if (PathSupport) {
118			char* cstr = PathSupport->absolute_path(PathSupport->host_data,
119			path.c_str());
120			const String abstract_path(cstr);
121			free(cstr);
122			return abstract_path;
123			}
124			return path;
125			}
126	persson	1777
127	capela	2174	void PluginLv2::Save(LV2_Persist_Store_Function store, void* host_data) {
128			if (NewFileSupport) {
129			char* path = NewFileSupport->new_file_path(PathSupport->host_data,
130			"linuxsampler");
131			dmsg(2, ("saving to file %s\n", path));
132	persson	1777
133	capela	2174	std::ofstream out(path);
134			out << GetState();
135	persson	1777
136	capela	2174	const String abstract_path = PathToState(path);
137	persson	1777
138	capela	2174	store(host_data,
139			uri_to_id(NULL, NS_LS "state-file"),
140			abstract_path.c_str(),
141			abstract_path.length() + 1,
142			uri_to_id(NULL, LV2_FILES_URI "#AbstractPath"),
143			LV2_PERSIST_IS_PORTABLE);
144			} else {
145			dmsg(2, ("saving to string\n"));
146	persson	1777
147	capela	2174	std::ostringstream out;
148			out << GetState();
149
150			store(host_data,
151			uri_to_id(NULL, NS_LS "state-string"),
152			out.str().c_str(),
153			out.str().length() + 1,
154			uri_to_id(NULL, NS_ATOM "String"),
155			LV2_PERSIST_IS_POD \| LV2_PERSIST_IS_PORTABLE);
156			}
157	persson	1777	dmsg(2, ("saving done\n"));
158			}
159
160	capela	2174	void PluginLv2::Restore(LV2_Persist_Retrieve_Function retrieve, void* data) {
161			size_t size;
162			uint32_t type;
163			uint32_t flags;
164
165			const void* value = retrieve(
166			data,
167			uri_to_id(NULL, NS_LS "state-file"),
168			&size, &type, &flags);
169
170			if (value) {
171			assert(type == uri_to_id(NULL, LV2_FILES_URI "#AbstractPath"));
172			const String path = PathFromState((const char*)value);
173			dmsg(2, ("linuxsampler: restoring from file %s\n", path.c_str()));
174			std::ifstream in(path.c_str());
175			String state;
176			std::getline(in, state, '\0');
177			SetState(state);
178			return;
179	persson	1777	}
180	capela	2174
181			value = retrieve(
182			data,
183			uri_to_id(NULL, NS_LS "state-string"),
184			&size, &type, &flags);
185			if (value) {
186			dmsg(2, ("linuxsampler: restoring from string\n"));
187			assert(type == uri_to_id(NULL, NS_ATOM "String"));
188			String state((const char*)value);
189			SetState(state);
190			return;
191			}
192
193			// No valid state found, reset to default state
194			dmsg(2, ("linuxsampler: restoring default state\n"));
195			SetState(DefaultState);
196	persson	1777	}
197
198			LV2_Handle instantiate(const LV2_Descriptor* descriptor,
199			double sample_rate, const char* bundle_path,
200			const LV2_Feature* const* features) {
201			return new PluginLv2(descriptor, sample_rate, bundle_path, features);
202			}
203
204			void connect_port(LV2_Handle instance, uint32_t port, void* data_location) {
205			static_cast<PluginLv2*>(instance)->ConnectPort(port, data_location);
206			}
207
208			void activate(LV2_Handle instance) {
209			static_cast<PluginLv2*>(instance)->Activate();
210			}
211
212			void run(LV2_Handle instance, uint32_t sample_count) {
213			static_cast<PluginLv2*>(instance)->Run(sample_count);
214			}
215
216			void deactivate(LV2_Handle instance) {
217			static_cast<PluginLv2*>(instance)->Deactivate();
218			}
219
220			void cleanup(LV2_Handle instance) {
221			delete static_cast<PluginLv2*>(instance);
222			}
223
224	capela	2174	void save(LV2_Handle handle, LV2_Persist_Store_Function store, void* callback_data) {
225			return static_cast<PluginLv2*>(handle)->Save(store, callback_data);
226	persson	1777	}
227
228	capela	2174	void restore(LV2_Handle handle, LV2_Persist_Retrieve_Function store, void* callback_data) {
229			return static_cast<PluginLv2*>(handle)->Restore(store, callback_data);
230	persson	1777	}
231
232			PluginInfo PluginInfo::Instance;
233
234			PluginInfo::PluginInfo() {
235			Lv2.URI = "http://linuxsampler.org/plugins/linuxsampler";
236			Lv2.activate = activate;
237			Lv2.cleanup = cleanup;
238			Lv2.connect_port = connect_port;
239			Lv2.deactivate = deactivate;
240			Lv2.instantiate = instantiate;
241			Lv2.run = run;
242			Lv2.extension_data = extension_data;
243	capela	2174	Persist.save = save;
244			Persist.restore = restore;
245	persson	1777	}
246
247
248			const void* extension_data(const char* uri) {
249			dmsg(2, ("linuxsampler: extension_data %s\n", uri));
250	capela	2174	if (strcmp(uri, LV2_PERSIST_URI) == 0) {
251			return PluginInfo::Lv2PersistDescriptor();
252	persson	1777	}
253			return 0;
254			}
255			}
256
257
258			extern "C" {
259			LV2_SYMBOL_EXPORT
260			const LV2_Descriptor* lv2_descriptor(uint32_t index) {
261			return index == 0 ? PluginInfo::Lv2Descriptor() : 0;
262			}
263			}